Spirax Sarco SafeBloc DBB3 Installation And Maintenance Instructions Manual Download Page 1

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IM-P184-09

CMGT Issue 4

1. Safety information

2. General product information

3. Installation

4. Commissioning

5. Operation

6. Maintenance

7. Spare parts

Printed in GB

1849050/3

Spirax SafeBloc

DBB3 Double Block and Bleed

Bellows Sealed Stop Valve

Installation and Maintenance Instructions

IM-P184-09

CMGT Issue 4

Summary of Contents for SafeBloc DBB3

Page 1: ...ct information 3 Installation 4 Commissioning 5 Operation 6 Maintenance 7 Spare parts Copyright 2018 Printed in GB 1849050 3 Spirax SafeBlocTM DBB3 Double Block and Bleed Bellows Sealed Stop Valve Ins...

Page 2: ...are in Group 2 of the above mentioned Pressure Equipment Directive ii Check material suitability pressure and temperature and their maximum and minimum values If the maximum operating limits of the p...

Page 3: ...hocks 1 7 Pressure systems Ensure that any pressure is isolated and safely vented to atmospheric pressure Consider double isolation double block and bleed and the locking or labelling of closed valves...

Page 4: ...C 752 F Many products are not self draining Take due care when dismantling or removing the product from an installation refer to Maintenance instructions 1 14 Freezing Provision must be made to protec...

Page 5: ...P or socket weld connection and must be stated at the time of order placement Standards This product fully complies with the requirements of the Pressure Equipment Directive PED and carries the mark w...

Page 6: ...nimum operating temperature Note For lower operating temperatures consult Spirax Sarco 10 C 14 F Designed for a maximum cold hydraulic test pressure of 60 bar g 870 psi g Body design conditions ANSI 3...

Page 7: ...efore commissioning of the line 3 3 The valve can be installed in the horizontal or vertical plane When installed in the horizontal plane the bleed port should ideally be positioned at the bottom see...

Page 8: ...ly closed 5 3 If valve keys are used care must be taken not to use excessive force when opening or closing the valve 5 4 A Valve Integrity Test must be undertaken prior to each double isolation of the...

Page 9: ...harge after a short period consult Spirax Sarco Service Department Note Handwheels should always be opened slowly to avoid system shocks Operation sequence for the Spirax SafeBlocTM Flow Left to Right...

Page 10: ...reassembling ensure that all joint faces are clean Ensure that the correct tools and necessary protective equipment are used at all times When maintenance is complete open isolation valves slowly and...

Page 11: ...sh isolation integrity Step 4 Depressurise the downstream system Step 5 It is now safe to maintain the downstream system Return to Step 1 Please note The Spirax SafeBlocTM is shown with the bellows se...

Page 12: ...be unscrewed from the bonnet bush When the stem 6 is disconnected from the bonnet bush unscrew the gland nut and remove both this and the gland washer Keep these parts safe as they are not supplied a...

Page 13: ...IM P184 09 CMGT Issue 4 13 Fig 4 7 Bonnet bush 10 Bellows support collar 1 9 11b 5 11a Position indicator clip on 6 8 Gland washer Gland nut Locking screw Main handwheel nut 2...

Page 14: ...fully assembled remember to create a safe seal between the gland packing ring 8 and the stem 6 by tightening down the gland nut to the recommended tightening torque see Table 1 6 7 How to fit the disc...

Page 15: ...6 8 Gland washer Gland nut Locking screw Main handwheel nut 2 6 8 Final assembly Ensure the bellows support collar and gaskets 11a and 11b are accurately aligned with the bonnet 2 before final assemb...

Page 16: ...overhaul of the valve 2 x each spare is required 7 Spare parts How to order spares Please note for customer convenience spares are supplied in kits to ensure all the appropriate replacement parts are...